I have to talk with Matthias regarding the Quest Questions and answers but parallely I am doing the pestilence quest.
I went to the quest marker and cannot find Matthias:
It should look like here: https://guides4gamers.com/sites/7/screenshots/2018/03/1920/find-out-what-happened-to-matthias-2.jpg
I never have been to this place before. So what can I do?